Broken Sword 4 problems!

I know this game is old, but I recently got a laptop and I thought I would try to play this game. When I play it it's laggy, the screen freezes and the mouse is all over the place.

Here are the specs of my laptop:

Toshiba Satellite, A505-S6965
Operating system: Windows 7
Processor: intel(R) Core(TM)2 Duo CPU 2.00GHz
RAM: 4.00GB
System type: 64- bit operating system
Graphics: (integrated) ATI Mobility Radeon™ HD 4570


PLEASE I WOULD REALLY LOVE SOME HELP! THANKS IN ADVANCE!
 
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